Sacral Authority belongs to Generators and Manifesting Generators whose Solar Plexus is undefined. The decision-making mechanism is a pre-verbal response that originates in the Sacral Centre and shows up most clearly as sound. An open, rising 'mmm-hmm' for yes. A closed, falling 'unh-unh' for no. The sound is not poetic shorthand. It is the actual signal.
If you have Sacral Authority, your decisions belong to your body in a more literal sense than is true for most people. The mind's role is to notice the response, not to produce it. The mind's habit, especially in women trained to be reasonable, is to override the response with a thoughtful explanation for why the opposite would be more sensible. She Who Returns is, in many ways, a place to unlearn the override and start hearing the body again.
The override is the whole problem
Almost every Sacral problem traces back to the override. The body said no; the mind said it would be rude to refuse. The body said yes; the mind said it was not a sensible time. The override seems harmless in any single instance and is catastrophic in aggregate. Each one chips away at the trust between your mind and your body, and that trust is the foundation of everything Human Design has to offer Sacral types.
The repair is unromantic. Notice the response. Honour it. Repeat. Over weeks and months, the signal gets clearer, the overrides get rarer, and the texture of your life starts to reflect the shape of what your body actually wants.